"An essential point is to increase productivity," said Masataka Tamaki, general manager of corporate planning at H.I.S. He said only one person needs to oversee the robot cafe, compared to several people needed at a regular coffee shop, so it can serve better quality coffee at a reasonable price.

Tamaki says it's not just about efficiency. "We want the robot to entertain customers so it's not like buying coffee at a vending machine," he said.

Takeshi Yamamoto, a 68-year-old restaurant employee who works in the neighborhood, said his first experience with the robot cafe was very enjoyable, and his robot-made coffee was delicious.

"It's quite rich, and tastes very good," Yamamoto said, as he took a sip. "You can get machine-made coffee at convenience stores, too, and it's actually good. But here, I had great fun."